...every death through a gun is unnecessary IMO.
Yes and no...
If I am in a situation where I am attacked, and it comes down to my life or his, it will be his, and will be necessary from my perspective at that moment.
You could argue that the attack was probably unnecessary, and therefore the resulting death, but I wouldn't have control over that particular part of the equation.
Just imagine - and that's only a thought experiment now - you'd have a law tonight which says that you have from right now on a certain amount of time to return all your registered weapons. They get refunded by tax deduction or whatever and you can turn in your ammo as well(But that's voluntary since there's no registration on the amount of ammo you buy and use).
If you fail to do it afterwards state employees would pursue the missing guns and hand out penalties on them that are hefty and it's added to your criminal record.
Think how that would affect the spread of guns long term. Of course there will be people who'll try to make a business out of this situation.
Afterwards you can install a new gunlaw how to get a gun license for sports on a gun range or hunting.
But you have no longer the right to carry them to your home but instead they're stored at the shooting range or wherever at a protected place.
This would never work, and here's why: I don't know what the ratio of registered to unregistered firearms is, but most states don't have registration requirements for handguns, shotguns, or regular rifles. I'm guessing, but I would assume the number of guns in circulation that have a clear paper trail is low. In most places, private sales are legal, and require no documentation, so it is difficult to verify ownership. The assumption that all gun owners would comply with an outright gun ban is naive, at best. It is more likely, IMO, that you would see the formation of the militias that the second amendment cites, and extensive civil conflict. But let's say all registered guns are turned in. What then? This has been explained, ad nauseam, but by eliminating only the firearms that are least likely to be used in an illegal manner, the only thing you accomplish is taking away a measure of protection from those who obey the laws. The only way this works is if all guns are recovered, and that would be a nearly impossible task.